In general I think chocolate is considered poisonous to most animals. However, that said, I also believe that in small enough amounts it won't kill any animals. Chocolate is supposed to be deadly poisonous to cats -- even in tiny amounts -- but I have a cat who busted into a saran-wrapped brownie and nibbled off a fairly large corner, to no apparent ill effect.

Quote:When I had Puff-n-Stuff she used to climb up me to steal part of any Crunch bar I was eating. She didn't like any other kind of chocolate, but would chew her way through a shopping bag to get to a Crunch bar. Neither the bag nor the chocolate did immedate harm, although she did die of cancer at the ripe old age of 16....